Discussions By Condition: Male sexual conditions

Sore Penis Head

I'm 23 years old and just a couple days ago I started having a really sensitive pain on the head of my penis. It looks perfectly normal but if you barely squeeze it or put pressure on the head it hurts really bad almost like a bruise. Also when I pee it hurts but only at the head of my penis. Me and my girlfriend are std free so I don't know what to do. What is wrong with it?